scope:

(a) Except as stated in -1100(c) through -1100(f), this Case provides alternative examination requirements and acceptance standards for volumetric examination of NPS 2 (DN 50) and greater and visual examination of greater than NPS 1 (DN 25) pressure retaining Class 1 PWR piping and vessel nozzle butt welds fabricated with Alloy 82/182 materials, with or without application of mitigation activities. Pressurizer nozzle butt welds are considered part of the hot leg welds.

(b) This Case may not be used to perform mitigation activities. For the types of mitigation activities identified in -2410(a), this Case provides pre-mitigation examination requirements, configuration requirements, stress improvement performance criteria, and preservice examination requirements.

(c) Butt welds described in (a) above with normal operating temperatures of less than 525°F (274°C) are not included in this Case.

(d) Pressure retaining welds in control rod drive and instrument nozzle housings of reactor vessel heads are not included in this Case.

(e) Alloy 82/182 welds never exposed to the reactor water environment are not included in this Case.

(f) If a mitigated or unmitigated butt weld initially included in -1100(a) is subsequently completely removed and replaced with PWSCC resistant materials, the weld will no longer be included in the scope of this Case. The weld shall be added to the ISI Program as a new weld in accordance with IWB-2412(b) in editions and addenda up to and including the 2006 Addenda and in accordance with IWB-2411(b) in the 2007 Edition or later editions and addenda.